condition mean min max ZT0-3 9.89988 9.89988 9.89988 ZT4-7 3.941685 3.941685 3.941685 ZT8-11 5.939965 5.939965 5.939965 ZT12-15 9.461155 9.461155 9.461155 ZT16-19 14.3639 14.3639 14.3639 ZT20-23 8.50221 8.50221 8.50221